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seraphim [82]
2 years ago
14

why did mendeleev leave blank spaces on his periodic table? did later discoveries justify his predictions?

Chemistry
1 answer:
schepotkina [342]2 years ago
7 0

Answer:

mendeleev left a space

Explanation:

so the periodic table can be organize

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The chromosomes line up towards the center during B. Metaphase
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What species has an atom with an oxidation number of 3
Montano1993 [528]
So we found out that chlorine had an overall oxidation number of plus three, and that's it for this one.
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wel
The first bubble after "water evaporates" should be something along the lines of that the water condenses in the clouds and then the following bubble should be that the water is released from the clouds. Does that make sense to you?
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3 years ago
How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?
Alenkinab [10]

Answer:

3.0 moles.

Explanation:

  • It is a stichiometry problem.
  • The chemical reaction of reacting hydrogen with oxygen to produce water is:

<em>H₂ + 1/2 O₂ → H₂O.</em>

  • It is clear that <em><u>1.0 mole of H₂</u></em> reacts with 0.5 mole of O₂ to produce <u><em>1.0 mole of  water</em></u>.
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∴ The number of moles of water created from reacting 3.0 moles of hydrogen completely with excess oxygen = 3.0 moles.

4 0
3 years ago
Sevin, the commercial name for an insecticide used to protect crops such as cotton, vegetables, and fruit, is made from carbamic
xeze [42]

Answer:

Explanation:

Ratio of mass of C , N , H and O

= .8007 :0.9333:0.2016:2.133

Ratio of moles of C , N , H and O

= .8007/12 : .9333 / 14 : 0.2016 / 1 : 2.133/16

= .0667 : .0667: .2016 : .1333

= .0667 / .0667 : .0667 / .0667 : .2016 /.0667 : .1333 / .0667

= 1 : 1 : 3: 2

Hence empirical formula = CNH₃O₂

7 .

Weight of titanium Ti = 1.916 g

Weight of oxygen = 3.196 - 1.916 = 1.28 g

Ratio of weight of Ti and O

= 1.916 : 1.28

Ratio of moles  of Ti and O

1.916/48 : 1.28/16  [ Molecular  weight of Titanium is 48 ]

= .04 : .08

= .04/.04 : .08/.04

= 1 :2 .

Empirical formula

TiO₂

5 0
2 years ago
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